How to calculate the 8 1 digit of the mobile phone number?

The 8 1 rational number of a mobile phone number means that every digit of the mobile phone number is multiplied, and then odd digits are multiplied to get a sum, and even digits are multiplied to get another sum, and two sums are added.

The known mobile phone number is 1323232324.

According to the calculation method of 8 1 rational number, 8 1 rational number can be obtained:

The number 8 1 = 5

So in the 8 1 rational number of the mobile phone number, the 8 1 rational number is 5.